this post was submitted on 15 May 2025
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Is it more efficient to cycle the room temperature though? I've heard it's better to get a room to temp and the machine can work less to maintain it. But maybe that's old advice..
That is old advice. AC works pretty fast, especially in a small hotel room. If you have floor heating/cooling and a heat pump then it would make sense to leave it on all day.
Air conditioners are heat pumps.
Yes I know, I meant air/water heat pumps which heat/cool the mass of a building instead of the air. AC units are oversized more often than not and are not that efficient at modulating. I think it's safe to say that it's more efficient to turn it of when you leave for more than an hour or two
I think that advice is specific to the “underground heat exchanger” type of heat pump.
It’s not; air source are also not particularly fast to make significant temperature changes compared with gas or electric heat when appropriately sized.
It is more specific to radiant (water/steam/in-floor) solutions though, as that is very slow to adjust